// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_
#define MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_

#include <stdint.h>

#include <string>
#include <vector>

#include "base/macros.h"
#include "media/base/media_log.h"
#include "media/formats/webm/webm_parser.h"

namespace media {
class AudioDecoderConfig;
class EncryptionScheme;

// Helper class used to parse an Audio element inside a TrackEntry element.
class WebMAudioClient : public WebMParserClient {
public:
    explicit WebMAudioClient(const scoped_refptr<MediaLog>& media_log);
    ~WebMAudioClient() override;

    // Reset this object's state so it can process a new audio track element.
    void Reset();

    // Initialize |config| with the data in |codec_id|, |codec_private|,
    // |encryption_scheme| and the fields parsed from the last audio track element
    // this object was used to parse.
    // Returns true if |config| was successfully initialized.
    // Returns false if there was unexpected values in the provided parameters or
    // audio track element fields.
    bool InitializeConfig(const std::string& codec_id,
        const std::vector<uint8_t>& codec_private,
        const int64_t seek_preroll,
        const int64_t codec_delay,
        const EncryptionScheme& encryption_scheme,
        AudioDecoderConfig* config);

private:
    // WebMParserClient implementation.
    bool OnUInt(int id, int64_t val) override;
    bool OnFloat(int id, double val) override;

    scoped_refptr<MediaLog> media_log_;
    int channels_;
    double samples_per_second_;
    double output_samples_per_second_;

    DISALLOW_COPY_AND_ASSIGN(WebMAudioClient);
};

} // namespace media

#endif // MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_
